Re: [PATCH V3] net/dt: Add support for overriding phy configurationfrom device tree

From: Ben Hutchings
Date: Tue Feb 04 2014 - 16:41:06 EST

On Tue, 2014-02-04 at 12:39 -0800, Florian Fainelli wrote:
> 2014-01-17 Matthew Garrett <matthew.garrett@xxxxxxxxxx>:
> > Some hardware may be broken in interesting and board-specific ways, such
> > that various bits of functionality don't work. This patch provides a
> > mechanism for overriding mii registers during init based on the contents of
> > the device tree data, allowing board-specific fixups without having to
> > pollute generic code.
> It would be good to explain exactly how your hardware is broken
> exactly. I really do not think that such a fine-grained setting where
> you could disable, e.g: 100BaseT_Full, but allow 100BaseT_Half to
> remain usable makes that much sense. In general, Gigabit might be
> badly broken, but 100 and 10Mbits/sec should work fine. How about the
> MASTER-SLAVE bit, is overriding it really required?

Yes, it is entirely possible that one or other of the clock modes
(locally generated vs recovered) is not reliable.

> Is not a PHY fixup registered for a specific OUI the solution you are
> looking for?

The fault is in the board, not the PHY.


Ben Hutchings
One of the nice things about standards is that there are so many of them.

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